On 10/23/2012 12:07 PM, Marc Dietrich wrote:

Pavan,

On Tuesday 23 October 2012 12:48:59 Pavan Kunapuli wrote:

quoted

Adding vmmc and vmmcq supplies for sdhci nodes
in tegra dt files.

<...>

quoted

diff --git a/arch/arm/boot/dts/tegra20-paz00.dts

b/arch/arm/boot/dts/tegra20-paz00.dts index 6a93d14..e161b65 100644

--- a/arch/arm/boot/dts/tegra20-paz00.dts
+++ b/arch/arm/boot/dts/tegra20-paz00.dts

@@ -422,13 +422,17 @@
 		status = "okay";
 		cd-gpios = <&gpio 173 0>; /* gpio PV5 */
 		wp-gpios = <&gpio 57 0>;  /* gpio PH1 */
-		power-gpios = <&gpio 169 0>; /* gpio PV1 */
 		bus-width = <4>;
+		vmmc-supply = <&vddio_sd_reg>;
+		vqmmc-supply = <&vddio_sd_reg>;
 	};

 	sdhci at c8000600 {
 		status = "okay";
 		bus-width = <8>;
+		vmmc-supply = <&vddio_sdmmc_reg>;
+		vqmmc-supply = <&vddio_sdmmc_reg>;

to make it better, this should be:

vmmc-supply = <&vcore_mmc_reg>; and
vqmmc-supply = <&vddio_nand_reg>;

with vcore_mmc_reg is ldo5 and vddio_nand_reg is the fixed regulator below.

I think for the eMMC (not SD card), the core supply is actually +3vs_s3,
and hence fixed; it looks like LDO5 used to be used, but they changed
it. See the note for the VCC connections on the eMMC chip.

By doing so, I get "sdhci-tegra sdhci-tegra.3: could not set regulator OCR 
(-1)". MMC subsys wants to set ldo5 to 3.3V but it is fixed. I guess that's 
harmless for now. 

What I mention above might end up fixing that?